A great back yard spot for the kids to pretend they're spending the day at the beach!
Assemble the pivot supports (F) to the canopy sides (G) using glue and (2) #6 x 1" drywall screws for each side. Next, attach the canopy ends (H) to the canopy sides (G) using glue and (2) #6 x 1-1/2" drywall screws on each end.
Using (2) 3/8" x 6" roundhead stove bolts, (4) 3/8" I.D. fender washers and (4) 3/8"-16 hex nuts, attach the top of the pivot supports (F) to the side posts. Tighten one hex nut on each side, leaving them loose enough for the canopy to pivot smoothly...then tighten the additional hex nuts against them as “jam-nuts”.
Insert (2) 3/8" x 5" carriage bolts, (2) 1/2" I.D. fender washers (on the head ends of the bolts), (2) 3/8" I.D. fender washers and (2) 3/8" - 16 wing nuts through the trunion arch of the pivot supports and into the side posts.
Glue and nail the seats to the front corners, then finish the sandbox with an exterior natural finish or weatherproof paint of your choice.
Sewing the canopy
Fold and pin a 3" hem on each end of the canvas (N). Use heavy thread and a heavy duty needle to sew an open ended hem on each end of your material. These hems will each hold a dowel rod. Slide the dowel rods (M) through the hems and hold them in position with a staple or small, large-headed carpet tack at each end. The canopy can then be rolled up for storage during bad weather.